Tone arm



2 SHEETS-SHEET l.

Jan. 16, 1923.

J. T. SIBLEY ET AL.

TONE ARM.

FILED APR. 24, 1919.

@WJ s 3%. ,J

A TTORNEY Jan. 16, 1923.

1. T. SIBLEY ET AL.

TONE ARM.

FILED APR. 24. |919.

2 SHEETS-SHEET 2.

A TTORNEY Patented Jan. 16, 1923.

UNITED STATE PATENT oFFlcE.

JAMES T. SIBLEY AND.CH.,ARLES E. WALDORF, PATERSON, NEW` JERSEY; SAIDWALDORF ASSIGNOR TO SAID SIBLEY.

TONE ARM. j

Application led April 24, 1919. Serial No. 292,382.

To all 'inkom t may concern.'

Be it known that we, JAMES SiBnEY and CHARLES E. WALDoRF,citizens ofthe.

United States, residing in the city of'Pat erson, county of Passaic, andState of New Jersey, have invented certain new and Iuseful Improvementsin Tone Arms', set forth in the annexed specification.

Our present invention relates to an improved tone arm for use inconnection with the stop device described in the application of -JamesT. Sibley, Serial No. 202,772, filed November 19th, 1917, and in fact isintended as a substitute for the tone arm of such prior application.

In the accompanying drawings- F ig.,` lis a longitudinal section o ffthetone arm and sound box extension.

Fig. 2 is a plan View of the same with the adapter extension arranged inposition to reproduce records of. the type- Fig. 3 is a side elevationof the tone arm with the sound box extension and adapter arranged `foruse in ,connection with records of the so-called Pathe type.

Fig. 4 is a similar view with the sound box extension and adapterarranged for use in Vconnection-with the co-called Edison t e.

y1Fig. 5 is an'enlarged view of the oscillating sound boxextension-.with the adapter x detached therefrom.

Fig. 6 is an end View showing the stop projections upon the couplingend. l

Fig. 7 is a side elevation of the adapter elbow. v

Fig. 8 is an end view of the same showing the stop notches. f

Fig. 9 is an opposite end view of the elbow showing the stop notches.

Fig. 10 is a side elevation of the sound box elbow. ,f

Fig. 11 is an end View showing the relative location yof the stopprojections.'

Fig. 12 is a rectified section ofthe stop projections upon theoscillating arm. shown in Fig. 5, l and the notches in the upperend ofthe elbow illustrated in Fig. 7.

Fig. 13 is a similar diagrammatic rectified view ofthe notches andstopprojections on the opposite end of -tlie elbow illustrated in Fig.7, and also of` the sound box elbow illustrated in Fig'. 10.y n l Agramophone I application (not shown);

I Similar "reference numerals refer to like parts throughout thespecication and drawings.. 1 'f Y Ti...V albumi "standard lis designedto be mounted 4vupon the upper side of a phonograph cabinet and servesas an element of the sound tube. `v`It is secured to the ca binet top2,l y means of the flange 3. An annular shoulder 4, is formed` byreducing the diameter of the upper part of the standard so as to forni aball-race for the balls 5. Within the tubular standard, and castintegral therewith is 4a spider 6, which serves as a support for thesheave 7, the purpose of which willbe hereafter explained. Sur-'rounding the upper reduced portion of the standard 1, is a sleeve `8,the lower end' of which is shouldered to bear upon' the balls 5. In theupper end of this sleeve is a ballrace shoulder 9, upon which the seriesofballs l0 is located. Within this enlarged upper en d of the sleeve 8,the section 11 isl inserted and rigidly secured in any convenient.manner, as by means vof a series of screws 12. The balls 10, are locatedin the race formed by the lower end'of thesection l1 and the shoulder 9.The peripheries of said balls are designed to contact with the upper endofthe standard 1, so that the sections 8 and 11, swing about thestandard 1 with very little-friction. l

In the section 11 is securedV a bracket 12, which carries a sheave 13.The outer free end of the section 11 is provided with a downwardextension 14, which is provided with a hook-shaped bearing uponl itsinside to receive atongue 15, upon the tone arm section 16, which latterhas its mating end of general spherical form, as at 17 so as to .form 4asubstantially sound proof joint beplace. The chain, or cable 19, isconnected to the upper end of the cross-piece 18, and passes Aover thesheave 13, upon the inside of the section 11, thence downwardly andlover the sheave 7, thence horizontally mechanism of the device" of thesaid prior The ,chain, -oi' to the stop its cable 19, is under a slighttension, as by the spring 19 insuflicient normally in itself to hold thesection 16 in axial alignment with the horizontal part of the section11. However, with the stop and repeat mechanism of said prior aplication devices are described for placing t e cable 19, under a greatertension so that the section 16 may be elevated automatically, s as toraisethe lsound Figs. 1 and 2, the axis of the lower part of the elbowwill lie in a vertical plane and be parallel to the axis of the section16. The shoulder 22,v of the section 16, is provided with V-shapedprojections 23-24, and also the square projection 25. The upper end ofthe elbow 21 is provided with an enlarged ,f collar 26, the internaldiameter of'which is vsufiicient to overlap the lar er .diameter of theangular end ofthe section'l. In the bottom of the race formed by thiscollar we provide a series of notches', as 27 28, 29, 30, 31, 32.Onreference to Fig. 12, it will-be noted that the notches 27-28 havesquare shoulders upon the. one side and inclined shoulders upon theother side; while the metalbetween the notches iscut away as at 27. rlhenotches 29,30, '31 and'32 are all Referring now toFig. 12 it will benoted that if the. elbow 21 is moved up into contact with section 16,the projection 25 will take into the notch 27, while the' projection 24will take into the notch 29, and projection 23 into the notch 31. Ifnow, the elbow 21 is moved to the left `the projection 25 will risev upon the inclined side wall of the notch 27 and the 1projections 24 and 23will corresponding y ride up on the inclined side walls of the notches29 and 31, until suchv time as the projection 25 comes to the notch 28,and simultaneously the notches 24 and 23, respectively, come intoregistry with notches 30 and 32, when, of course, the elbow 21 will bein position to slide axially on the thimble 20 to the depth permitted bythe series of notches in said elbow in connection with the matingprojections 23, 24 and 25. In other words, the rotation of the elbow 21upon the thimble 20 is attended by a longitudinal movement of said elbowon the thimble to the extent of the depth of the series of notches 27,28, 29, 30, 31 and 32. The rotation of the sound box thimble 33 upon theopposite end of the elbow 21, is attended with the same results. Theelbow 33 is pro- Within the endof the extension 16 is ay cross-piece 43,rigidly secured in place, and within the elbow 33, a similar cross-piecev44, is rigidly secured. Connecting these crosspieces 43 and 44, is atension spring 45, the purpose'of which is to yieldingly hold the threeelements 16, 21 and 33 together and yet permit 'the relative rotation ofthe elbow 21 upon the thimble 20, and also permit. the elbow 33 to turnupon the elbow 21; but the rotation of the elbow 21 upon the thimble 20is affected by a longitudinal movement of the elbow 21 upon the axis ofthe thimble 20 due tothe rise of the projections 23, 24 and 25 out ofthe notches 27, 29 and 31, and the riding of said projections upon theflat portions between said notches until the projection 25 reaches thenotch 28, and the projection 24 correspondingly reaches the notch 30,and the projection 23 reaches the notch 32, when theA spring 45 willcause the two parts to snap together and be held against accidentalrotation. Similarly the same spring. 45, being connected 'do thecross-piece 44, will permit the elbow 33 to be turned within the elbow21with its projections 34, 35 and 36 rising out of the notches 37, 39and 41, against the tension of the spring45, when of course, the elbow33 may be turned upon the common axis of the two elbows until such timeas the;

projections 34, 35 and. 36 dro notches 38, 40 and 42 respective y.

The square shoulder notches '27 and 28, in one vend of the elbow 21, andtheA square shoulder notches 37 and 38 in its opposite end serve tolimit the rotational movement of the parts, for it will be seen that thelimit of movement of the projection 25 is between the notches 27 and 28,and correspondingly the limit of movement ofthe elbow 33 and itsprojection 34, willl be the square shoulder notches 37 and 38. Thus. itwill be lseen that the extension 16 is provided with the adapter elbows21 and 33, whereby the three several positions of the sound box may beassumed as indicated in Figs. 1, 3 and 4; that is, with the plane of thediaphragm of the sound box vertical, as in Fig. 1, or inclined to theplane into the of the record, as in Fig.'3, or parallel to the plane ofthe record, as in Fig. 4.

From-a reference to Figs. 1 and 4, it will l be noted that the elbow 33is turned through van angle of 90 degrees in order that the sound box Smay occupy the positions shown in the two igures and that the axes ofthe elbow 21 lie in a common vertical lane. This being the case the stopnotches and 38 are located circumferentiall with their centers 90degrees apart.

notches 39 and 4G are 90 degrees apart, and.

Similarly thev the notches 41 and 42 are also 90 degrees apart; thus itwill be seen that the limit of throw for the elbow 33 is but 90 degrees.

From the position illustrated in Figs. 1 and 2, it will be noted lthatthe elbow 21 must be turned upon the diagonal axis in order that thesound box may assume the position illustrated in Fig. 3.

With the projections 23, 24, and 25, 120 degrees apart, we find that thecorrect distance for the pairs of notches 27 and 28, 29 and 30,. 30 and31, will be103 degrees apart respectively. When `these iangularitiea' ofnotches are selected, as above indicated, and the elbows are turned, asshown in the drawings, it is found that the plane of the diaphragm ofthe sound box will assume in cach case, the correct playing position forthe threetypes of records now most generally in use.- v

'Ihe provision of the internal spring 45 makes the use of externallocking devices for the adjustable sound box end of the tone armunnecessary, while it lalso serves to` iirmly hold the parts 4in theiradjusted positions and prevents any tendency to shift from thosepositions` in use.

rIlle depression 27 between the notches 27 and 28, and thedepression 37between the notches 37 and 38,` permit us to utilize the endwalls of thenotches 27-28 and 37 38 as stops to limit the angularity of the twoelbows 21 and 33. It will be noted that the depths of the notches 29,v30, 31 and 32 are the same as the depths of the notches 2'7-28 below thedepressed portion 27 Similarly the depths of the notches-39, 40, 41 and42 are the same as the depths of the notches 37 and 38 below thedepresion 37 In this manner the elbows 21 and 33may be turned pon theirrespective axes without binding or tilting of said elbows out of theiraxial alignment with each other and with the axis of the thimble 20.

It will thus be seen that we have provided a tone arm and sound boxadapted which is a distinct improvement over the tone arm shown in theprior application above referred to; that 'the tone arm and sound boxextension is so constructed that the chain, or cable 19, of said priorapplication, is completely enclosed within the tone arm and is there orenot liable to disarrangement when in use.

We have shown in Figs. 1 and 2 the segmental gear 50 as integral withthe sleeve 8, said segmental gear being untilized for the same purposeas indicated in the above named' prio-r application, and utilized inconnection with the stop and repeat mechanism therein described.

In Order to lock the sleeve 8 to the tubular standard 1, and yet permitthe tone arm to swing freely in a horizontal plane within the necessarylimits, we provide the tubular standard l. with a circumferential slot47, into which'the oint of the screw 46 enters, said screw eing insertedin the sleeve 8.

We claim:

1. In a-tone arm, the combination of a swinging sound tube, a sound boxsection pivoted upon the free end of said tube for vertical oscillation,a chain or cable within said tube and connected to said sound boxsection above its pivot for vertically elevating said sound box section.

2. In a tone arm, the combination of a horizontally swinging sound tubesection, a sound box section having its axis normally in alignment withthe axis of said sound tube and pivoted thereto at a point below saidaxes, and a chain or cable connected to said sound box .section at apoint'above its pivot end extending through the interior of said soundtube, whereby said sound box section may be elevated as and when saidchainor cable is put under ten- SlOn.

3. In a tone arm, the combination of a sound tube section mounted toswing in a horizontal plane, a sound box section havescv ing an oHsetpivotal connection with said sound box tube section whereby said soundbox section-may oscillate in a vertical plane, av chain or cableconnected to said sound box section above its pivot and extended throughthe interior of said sound tube section, and -means for putting saidcable under a normal tension whose tendencyfis to elevate said sound boxsection.

4. In a tone arm for talking machines, the combination of three tubularmembers arranged in end to end relation, mating notches and projectionsrespectively upon the adjacent ends of said members, a sprin within andconnecting the adjacent ends o the two non-adjacent members, forieldingly holding the three members in rictional end to end engagementbut permitting the turning of each member upon its next adjacent memberto shift the relative engagement of their respective mating notches andprojections.

JAMES T. SIBLEY. CHARLES E. WALDORF..

